Packing.



Patented Oct. 3l, |899. H. S.& M. MONTGOMERY.

PACKING.

"lipplicaton med June 7, 1899.)

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THE vNomus Farias co. mora-Uran., WASHINGTON, n. c,

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UNITED `STATES PATENT Prien.

IIENRY S. MONTGOMERY AND MARSHALL MONTGOMERY, OF PHILADELPHIA,

PENNSYLVANIA.

PACKING.

SPECIFICATION forming part of Letters Patent No. 636,052, dated October 31, 1899. Application filed June 7, 1899. Serial No. 719,703. (No model.)

To a/ZZ whom, it may concern.:

Be it known that we, HENRY S. MONTGOM- RRY and MARSHALL MONTGOMERY, of the city and county of Philadelphia and State of Pennsylvania, have invented an Improvement in Packing, of which the following is a specification.

Our invention has reference to piston-rod packing; and it consists of certain improvements which are fully set forth in the following specication and shown in the accompanying drawings, which form a part thereof.

The object of our invention is to provide a simple and efcient construction of packing suitable for piston-rods of steam-engines and for other purposes where a reciprocating or rotating rod or shaft is required to move for mechanical purposes and Where a steam or air tight joint is required.

In carrying out our invention we employ a packing of an eXpansible character colnprising two parts--namely, 011e laterally-expan sible to maintain a tight wearing contact and the other of a more compressible and absorbent nature and adapted to carry the lubricant.

More specifically considered, our in vention comprises a strand of packing material consisting of two parallel parts inclosed within a tightly-braided envelop, one of which parts is formed of a rectangular dense rubber sec tion divided obliquely and supported by an oblique sheet of lead or other highly smooth ductile substance and the other ofwhich parts comprises strands of cotton, braided or plain, having embedded therein, if desired, one or more strands or Wires of lead or highly ductile material, the construction being such that pressure applied in a direction adapted to press the cotton strands upon the rubber portions will cause the latter to slide upon their oblique surfaces and produce expansion and present the upper edge of the lead sheet in contact with the moving part, such as the piston-rod.

Our invention will be better understood by reference to the accompanying drawings, in whichy Figure 1 is a perspective view of a portion of our packing, showing a cross-section thereof; and Fig. 2 is alongitudinal section thereof.

A and B are two strands of rubber triangular in cross-section and With their oblique faces directed toward each other and supported by an interposed layer com prising the sheet C of lead. The strands A B are preferably formed of layers of rubber and textile material, as indicated, the edges of the latter being directed toward the moving part-as, for example, the piston-rod-so as to form a compound Wearing-surface adapted to make a tightvjoint and at the same time have great resisting qualities. Arranged immediately above the strand A and resting upon it is a longitudinal strand D yof cotton, which may be plain or, preferably, braided or plaited, as shown, in which are embedded one or more wires E F of lead. If desired, the central wire E may be employed alone or in conjunction with the four large longitudinal corner Wires E F, or vice versa, or all the wires E F may be omitted.

The several parts A O B D are tightly bound together in the relative arrangement shown in the illustration by an outer covering G of tightly-plaited cotton, the said outer covering being coated, if desired, with plumbago. The sheet C and wires E F being of lead, they are very ductile and adapt themselves to the curved shapes required to be given to the packing. While lead is preferred, it is evident that any alloy or other soft ductile material may be employed in lieu of lead. By interposing the lead sheet O between the oblique faces of the rubber sections A B the adjustment of these parts relatively to each other to expand the packing to compensate for wear is more readily secured, and consequently there is no necessity for objectionable compressing of the cotton strands D. The advantage of this is that the lubricant contained in the said cotton strands D is more readily retained, and consequently insures a more uniform action in the packing and increases its life, since it is maintained in a better lubricated condition. Furthermore, the employment of the lead enables the packing when cut and curved into the desired shape to retain the said shape when applied to the piston rod or plunger, according to the particular use to which it is applied. The upper edge of the oblique plate O of lead works against the surface of the piston-rod IOO and increases the tightness thereof to prevent leakage.

Having now described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. A packing for piston-rods and other purposes consisting of two triangular strands of rubber Composition forming when together a rectangular body the strands being separated by an oblique division-space, in combination with an interposed sheet of soft ductile metal such as lead extending from the upright face of one strand to the upright face of the other strand so as to cover the entire opposing oblique faces of the rubber strands and separate them, a longitudinal upper strand or layer of soft fibrous material such as cotton adapted to absorb a lubricant, and an outer covering of plaited textile material tightly binding the several parts together.

2. As an improved article of manufacture, a packing for piston-rods and other purposes consisting ot' two strands of rubber composition forming a rectangular body, each strand being triangular in cross-section and having its oblique face directed toward the oblique face of the other strand, in combination withan interposed sheet of ductile metal such as lead extending entirely across the width of the two strands and completely separating them from each other, a longitudinal strand.

HENRY S. MONTGOMERY. MARSHALL MONTGOMERY.

Witnesses:

HAROLD A. SHRYOCK, Wu. A. SHRYOCK. 

